<pre>
Hi, Angelo:

On Mon, 2023-07-17 at 16:14 +0200, AngeloGioacchino Del Regno wrote:
>
> External email : Please do not click links or open attachments until
> you have verified the sender or the content.
> If a controller (usually, eDP!) does not support audio, or audio is
> not
> enabled because the endpoint has no audio support, it's useless to
> lock
> a mutex only to unlock it right after because there's no
> .plugged_cb().
>
> Check if the audio is supported and enabled before locking the mutex
> in
> mtk_dp_update_plugged_status(): if not, we simply return immediately.
>
> While at it, since the update_plugged_status_lock mutex would not be
> used if the controller doesn't support audio at all, initialize it
> only if `audio_supported` is true.

Reviewed-by: CK Hu <ck.hu@mediatek.com>

>
> Signed-off-by: AngeloGioacchino Del Regno <
> angelogioacchino.delregno@collabora.com>
> ---
> drivers/gpu/drm/mediatek/mtk_dp.c | 7 +++++--
> 1 file changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_dp.c
> b/drivers/gpu/drm/mediatek/mtk_dp.c
> index 83e55f8dc84a..c1d1a882f1db 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dp.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dp.c
> @@ -1948,6 +1948,9 @@ static int mtk_dp_dt_parse(struct mtk_dp
> *mtk_dp,
>
> static void mtk_dp_update_plugged_status(struct mtk_dp *mtk_dp)
> {
> +if (!mtk_dp->data->audio_supported || !mtk_dp->audio_enable)
> +return;
> +
> mutex_lock(&mtk_dp->update_plugged_status_lock);
> if (mtk_dp->plugged_cb && mtk_dp->codec_dev)
> mtk_dp->plugged_cb(mtk_dp->codec_dev,
> @@ -2520,11 +2523,11 @@ static int mtk_dp_probe(struct
> platform_device *pdev)
> return dev_err_probe(dev, ret,
> "failed to request mediatek dptx
> irq\n");
>
> -mutex_init(&mtk_dp->update_plugged_status_lock);
> -
> platform_set_drvdata(pdev, mtk_dp);
>
> if (mtk_dp->data->audio_supported) {
> +mutex_init(&mtk_dp->update_plugged_status_lock);
> +
> ret = mtk_dp_register_audio_driver(dev);
> if (ret) {
> dev_err(dev, "Failed to register audio driver:
> %d\n",
> --
> 2.40.1

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